An alternative way to use the triplet energy of fluorescent dyes in organic light-emitting devices via an external iodide
An alternative way to use the triplet energy of fluorescent dyes in organic light-emitting devices via an external iodide
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DOI：
10.1016/j.orgel.2011.10.019
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发表时间：
2012
影响因子：
3.2
通讯作者：
X. Xing;T. Tsuboi;Y. Nakai;Fei Wang;Boyuan Qi;Zhijian Chen;Bo Qu;Lixin Xiao;Q. Gong
中科院分区：
文献类型：
--
作者：
X. Xing;T. Tsuboi;Y. Nakai;Fei Wang;Boyuan Qi;Zhijian Chen;Bo Qu;Lixin Xiao;Q. Gong
在含有聚乙烯基咔唑（PVK）作为主体的有机发光器件（OLED）中，已经鉴定出不寻常的重原子效应，红色荧光染料2-{2-甲基-6-[2-甲基-6-（三氟甲基）苯基]吡啶-2-基}（2-methyl-6-[2-methyl-6-[2-methyl-6-（三氟甲基）苯基]吡啶-2-基]吡啶-2-基}（2-methyl-6-[2-methyl-6-（三氟甲基）苯基]吡啶-2-基）。（2，3，6，7-四氢-1H，5 H-吡啶并[3，2，1-ij]喹啉-9-基）-乙烯基]-吡喃-4-亚基}-丙二腈（DCM 2）作为发射体，和非发射体1，8-二碘辛烷（RI）代替稀有金属作为重原子源。DCM 2的电致发光（EL）强度随RI浓度的变化而变化，当RI浓度为0.25%时，DCM 2的EL强度最大。PVK-DCM 2薄膜的光致发光（PL）光谱显示，在12 K下碘的存在下，DCM 2的单重态发射增加。碘离子诱导的荧光增强是由PVK的单重态和三重态到DCM 2的单重态的能量转移引起的。这些结果表明，一种替代的方式来使用的三重态能量的荧光材料与外部的重原子，而不是传统的磷光染料含有稀有重金属原子。
An unusual heavy atom effect has been identified in an organic light emitting device (OLED) containing polyvinylcarbazole (PVK) as the host, the red fluorescent dye 2-{2-methyl-6-[2-(2,3,6,7-tetrahydro-1H,5H-pyrido[3,2,1-ij]quinolin-9-yl)-vinyl]-pyran-4-ylidene}-malononitrile (DCM2) as the emitter, and non-emitting 1,8-diiodooctane (RI) as a heavy atom source instead of a rare metal. The intensity of electroluminescence (EL) of DCM2 changes with the concentration of RI, with a maximum EL intensity obtained for DCM2 at a concentration of 0.25% of RI. Photoluminescence (PL) spectra of PVK–DCM2 films show increased singlet emission from DCM2 in the presence of iodide at 12K. The enhanced fluorescence induced by iodide is caused by energy transfer from both the singlet and triplet states of PVK to the singlet states of DCM2. These results suggest an alternative way to use the triplet energy of fluorescent materials with external heavy atoms rather than conventional phosphorescent dyes containing rare heavy metal atoms.